Skid Pans - Design and construct largest driver training skid pan facility in New Zealand. Stats: At the time the largest outdoor one piece pour of post tension concrete slab in New Zealand. 1887.6 tonnes of concrete. 26,666 metres of stressing cable. 180 trucks of concrete. 73 people employed over a 24 hour duration of the pour. 6 concrete pump operators. 26 concrete layers.